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The Nautilus T616 and T618 vary a decent amount in certain important areas. Find out what model the best is for what people and training habits.
Some of the main differences between the Nautilus T616 and T618 are that the Nautilus T616 has a higher weight limit, a stronger motor, slightly bigger rollers, and longer warranties.
On the other hand, the Nautilus T618 has a slightly lower weight, has somewhat more compact dimensions, and is a nice amount more budget-friendly.
Before choosing one of these Nautilus treadmills you need to know that the customer reviews are not that positive at the time of writing. Enough to consider other treadmills like for example the Sole F80.
However, if you still want to choose between the Nautilus treadmills, there are some guidelines to make your decision easier.
If you only want to use your treadmill for light jogging or walking, the Nautilus T616 will likely be strong enough for your training goals. This option can save you a nice amount of money.
If you have an average body weight and plan to use your treadmill for fast running every once in a while, the Nautilus T616 should be good enough for you too.
For workout routines that are more intense than that and individuals with above-average body weights, the extra power and bigger rollers of the Nautilus T618 are likely worth investing in to reduce the risk of early wear and tear.
Differences Nautilus T616 vs Nautilus T618
The Nautilus T616 and T618 have a good number of things in common but there are also differences. These will make each model better for certain individuals and situations.
| Feature | Nautilus T616 | Nautilus T618 |
|---|---|---|
| Weight Limit | 300 Pounds (136 kg) | 350 Pounds (158 kg) |
| Motor Power | 3 CHP | 3.5 CHP |
| Rollers | 2.5″ Crowned Rollers | 2.75″ Crowned Rollers |
| Warranties* | 10 Years Frame And Motor Warranty, 3 Years Parts And Electronics Warranty, 1 Year Labor Warranty | 15 Years Frame And Motor Warranty, 5 Years Parts And Electronics Warranty, 2 Years Labor Warranty |
| Weight | 241 Pounds (109 kg) | 253 Pounds (114.7 kg) |
| Dimensions | 77.2” L x 35.2” W x 57.6” H | 78” L x 37.6” W x 62.8” H |
| Price Category** | $$$ | $$$$ |
| Check Current Price | Check Current Price |
*Warranties can vary from seller to seller
**Price category difference at the time of writing
Common features Nautilus T616 and Nautilus T618
Before investing in either the Nautilus T616 or T618 you may also want to know about their common features. These also play a role in the experience of your treadmill.
| Feature | Nautilus T616 | Nautilus T618 |
|---|---|---|
| Incline Options | 0% to 15% | 0% to 15% |
| Speed Range | 0-12 mph (19.31 kmh) | 0-12 mph (19.31 kmh) |
| Shock Absorption | Yes | Yes |
| Running Surface | 20″ x 60″ | 20″ x 60″ |
| Foldable | Yes | Yes |
| Screen | Blue Backlit DualTrack™ Screens | Blue Backlit DualTrack™ Screens |
| Workout Programs | 26 Pre-Programmed Workout Programs | 26 Pre-Programmed Workout Programs |
| Heart Rate Monitor | Contact Grips And Wireless Heart Rate Chest Strap Included | Contact Grips And Wireless Heart Rate Chest Strap Included |
| Device Holder | Yes | Yes |
| Bluetooth App Functionality | Yes | Yes |
| Bluetooth Audio Capabilities | Has Speakers But Only Audio Jack Input From Your Devices | Has Speakers But Only Audio Jack Input From Your Devices |
| Color Screen | No | No |
| Workout Fans | Yes | Yes |
| Check Current Price | Check Current Price |
Differences Nautilus T616 vs Nautilus T618 in detail
People who are more familiar with treadmill features may be able to choose between the Nautilus T616 and T618 by taking a look at the feature and price differences.
On the other hand, you may be unsure about what certain features mean, why they are important, and to what extent they should play a role in your decision.
Weight limit
The weight limit of a treadmill is somewhat of a straightforward feature but it matters in more ways than some people think.
Before going into the consequences, the Nautilus T616 has a weight limit of 300 pounds (136 kg). The Nautilus T618 is a bit sturdier with a weight limit of 300 pounds (136 kg).
The first reason why you don’t want to go over these numbers is that the treadmills could simply break down. However, even if they don’t, going over the weight limit can speed up wear and tear and void the warranties.
Additionally, the weight limits are somewhat of an indication of how strong the materials, construction, and motor is of each treadmill. The Nautilus T618 performs just a bit better in these areas.
Winner: Nautilus T618
Motor power
In their essence, treadmills are simply rotating belts. This concept allows you to walk or run while staying in the same place.
An important part of making this happen is the treadmill motor and more specifically, how much power it can generate. This area can vary a lot between different models.
The Nautilus T616 seems to have a motor power of 3 CHP (although this is not clearly mentioned). The motor of the Nautilus T618 has 3.5 CHP (again not always clearly mentioned).
A general recommendation is that people with average body weights want at least 3 CHP for fast running. Individuals with above-average body weights want a motor power of at least 3.5 CHP.
That being said, even if you have an average weight, the stronger motor of the Nautilus T618 will generally last longer in both single workouts and over the years.
The more people will use the treadmill, the more intense their workout programs, and the heavier they are, the more you want to lean towards the Nautilus T618.
Winner: Nautilus T618
Rollers
Two other important components for allowing the belt to rotate are the treadmill rollers. These are the two big cylinders the belt is stretched around. Again, different treadmills can vary in this area.
The Nautilus T616 seems to have 2.5″ rollers (although this is not that clearly mentioned). The rollers of the Nautilus T618 are slightly bigger than that with sizes of 2.75″.
A rough guideline is that bigger treadmill rollers tend to be preferred (up to a certain point). The first reason for this is that they tend to cause less wear and tear to the motor and belt compared to smaller rollers.
Secondly, bigger rollers tend to reduce the risk of the belt slipping over the rollers. Slipping treadmill belts during workouts can be annoying so avoiding this is a plus.
One thing to keep in mind is that a treadmill motor has to be strong enough to deal with the bigger rollers. This interaction is not always easy to predict.
In the case of the Nautilus T618, there are no mentions of this area at the time of writing. That means you can likely expect some of the benefits above over the Nautilus T616.
Winner: Nautilus T618
Warranties
Warranties are how long a company is willing to replace certain parts if they break down under normal use. Even though the Nautilus T616 and T618 are from the same brand, they have different warranties.
More specifically, the Nautilus T616 has 10 years frame and motor warranty, 3 years parts and electronics warranty, and 1 year labor warranty.
The warranties of the Nautilus T618 are a nice amount longer. These include 15 years fame and motor warranty, 5 years parts and electronics warranty, and 2 years labor warranty.
When comparing two different treadmill brands, the warranties can give you an idea about how much each company stands behind the quality of its products.
That being said, in cases where the treadmills are from the same brand, longer warranties are also somewhat of a premium feature. Not necessarily a difference in quality.
In any case, the warranties of the Nautilus T618 are a nice amount longer than the ones of the Nautilus T616.
How important this is to you depends on things like how long you plan to use your treadmill and your risk tolerance.
Winner: Nautilus T618
Weight
The weight of a treadmill is another relatively straightforward feature. However, you may be unsure about how this detail plays a role in your experience of the machine.
In some cases, the floor that will carry the treadmill has a limited weight capacity. In a situation like that, you want to take a careful look at the weight of each treadmill.
That being said, people generally care more about treadmill weight because they want to move their machines around. Both the Nautilus T616 and T618 can be folded and have transport wheels.
Even so, it will be just a bit easier to move the 241 pounds (109 kg) of the Nautilus T616 around than the 253 pounds (114.7 kg) of the Nautilus T618.
This small difference is likely not enough to completely change your decision.
However, individuals who want to move their treadmill around a lot and are not that strong may want to keep the weights in the back of their minds.
Winner: Nautilus T616
Price
Besides weight (and dimensions to a tiny extent), most people will prefer the features of the Nautilus T618 over the ones of the Nautilus T616.
Even so, you want to keep in mind that this also comes at a higher price.
The exact difference will depend on where you get each treadmill and can change over time. That being said, at the time of writing, the Nautilus T616 is a nice amount more budget-friendly than the Nautilus T618.
Winner: Nautilus T616
Is the Nautilus T616 or Nautilus T618 right for you?
Because they are from the same brand and product line, you can expect that the feature and price differences of the Nautilus T616 and T618 give a good idea about what model the best choice is for your personal situation.
However, in the case of these two treadmills from Nautilus, you definitely still want to take a look at the customer reviews.
While there are not that many reviews at the time of writing, customers are currently not that happy about both the Nautilus T616 and the Nautilus T618.
There are a decent amount of mentions about the deck breaking after relatively short use. The technology of the monitors also does not look optimal.
Some people experienced situations where the treadmill randomly turned on or jerked in terms of speed.
Issues can happen but for this price point, the Nautilus T616 and Nautilus T618 have a relatively high number of these. Likely enough to consider other treadmills.
What model is right for you
In short, the Nautilus T618 has a higher weight limit, a stronger motor, slightly bigger rollers, and longer warranties.
The Nautilus T616 has a slightly lower weight, somewhat more compact dimensions, and a price that is a nice amount more budget-friendly.
Something to note first is that the customer reviews of these treadmills are not that positive. It looks like other treadmills like for example the Sole F80 would be a better choice.
That being said, if you still want one of the two Nautilus treadmills there are still some guidelines to make your decision easier.
First of all, people who only plan to use their treadmill for walking or light jogging will likely find the Nautilus T616 strong enough. Choosing this model can save these individuals some money.
People with an average body weight who do plan to use their treadmills for fast running but not that often will likely find the Nautilus T616 strong enough too.
Individuals with above-average body weights or individuals with very intense workout programs will likely need the extra power and bigger rollers of the Nautilus T618 to reduce the risk of early wear and tear.
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